Device for cleaning wastewater

Abstract

The invention relates to a device for cleaning wastewater, wherein at least one flow channel (S, S 1, S 2 ) having at least one horizontal agitator ( 5 ) disposed therein in the treatment basin (B), and wherein a cross-sectional surface (Q) of the flow channel (S, S 1, S 2 ) extending perpendicularly to the flow direction (SR) increases steadily upstream and downstream from the horizontal agitator ( 5 ).

1 - 8 . (canceled) 
     
     
         9 . A method for generating a circulating flow in a treatment basin for cleaning wastewater, wherein at least one circulating flow channel (S, S 1 , S 2 ), which has a bottom and two walls located opposite each other, is provided in the treatment basin (B), wherein at least one horizontal agitator ( 5 ) comprising a propeller is disposed in the flow channel (S, S 1 , S 2 ), and wherein a cross-sectional area (Q) of the flow channel (S, S 1 , S 2 ) extending perpendicularly to a flow direction (SR) increases upstream and downstream of the horizontal agitator ( 5 ),
 wherein the cross-sectional area (Q) increases continuously upstream and downstream of the horizontal agitator ( 5 ) up to a specified distance from the horizontal agitator ( 5 ),   wherein the increase in the cross-sectional area (Q) is formed by a bulge ( 6 ) directed into the flow channel (S, S 1 , S 2 ), which is provided at at least one wall and/or the bottom of the flow channel (S, S 1 , S 2 ), and   wherein the horizontal agitator ( 5 ) is disposed in the region of a minimum of the cross-sectional area (Q) of the flow channel (S, S 1 , S 2 ) formed by the at least one bulge ( 6 ),   characterized in that   a rotational speed and a design of the propeller are selected such that a second volume of a valley formed at a surface of the wastewater due to an eddy of the horizontal agitator ( 5 ) is equalized by a first volume of the bulge(s) ( 6 ) protruding from the at least one wall and/or from the bottom.   
     
     
         10 . The method according to  claim 9 , wherein the cross-sectional area (Q) of the flow channel (S, S 1 , S 2 ) is approximately equal upstream and downstream of the bulge(s) ( 6 ). 
     
     
         11 . The method according to  claim 9 , wherein the two walls, which are opposite each other, each comprise a bulge ( 6 ) in a symmetrical design. 
     
     
         12 . The method according to  claim 9 , wherein at least one of the walls is a flow guide wall ( 3 ,  7 ) provided within the treatment basin (B). 
     
     
         13 . The method according to  claim 9 , wherein a flow channel (S, S 1 , S 2 ) having a horizontal agitator ( 5 ) disposed therein is provided on either side of the flow guide wall ( 3 ,  7 ). 
     
     
         14 . The method according to  claim 9 , wherein the at least one bulge ( 6 ) is produced as one piece with the wall or the bottom. 
     
     
         15 . The method according to  claim 9 , wherein the at least one bulge ( 6 ) is formed by a lamination mounted at the wall or the bottom.